The most valuable black opal features bright red stone against a very black base. In the '80s and '90s, gem-quality brown diamonds were worth about $1,500 per carat, but now many sell for up to $ ...
Following is a transcript of the video. Narrator: High-quality black opal can cost over $10,000 per carat, making it one of the world's most expensive gemstones. But mining black opal isn't easy.
Australian Women's Weekly on MSN9mon
The women of the Australian outback’s black opal fields“People became aware that they were sitting on, not just opal but this incredible huge fossil province, and sometimes the ...
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